Rotatable cantilevered shell molding machine

ABSTRACT

A machine for making shell molds or cores having improved safety, serviceability and maintenance which includes a single large ball bearing supporting the radial, thrust and the moment load of the rotating carriage with a considerable safety factor, the carriage thus projecting in cantilever fashion from the base, the distal end of the carriage being provided with a door, the actuating mechanism being an enclosed rack and gear providing constant torque, the operation of the door and the locking of the door being accomplished by piston-cylinder assemblies at the proximal end of the carriage out of the high temperature zone adjacent the tooling,and a simplified automatic sand feed system utilizing a large rubber ball check valve.

United States Patent Blower et al.

[54] ROTATABLE CANTILEVERED SHELL MOLDING MACHINE [72] Inventors: WarrenA. Blower, Bercksville; Gilbert J. Janke, Parma; Edward D. Abraham,Cleveland, all of Ohio 73 Assignee: The Sherwin-Williams Company,

Cleveland, Ohio 22 Filed: Sept. 22, 1970 21 Appl. No.: 74,424

[56] References Cited UNITED STATES PATENTS Shallenberger et al. 164/ l65 3,184,809 5/ 1965 Stewart 164/ 165 d T u 44 43 [451 Aug. 8, 1972Primary ExaminerR Spe'ncer Annear Attorney-Oberlin, Maky, Donnelly &Renner i 57' ABSTRACT A machine for making shell molds orcores havingimproved safety, serviceability and maintenance which includes a singlelarge ball bearing supporting the radia], thrust and the moment load ofthe rotating carriage with a considerable safety factor, the carriagethus projecting in cantilever fashion from the base, the distal end ofthe carriage being provided with a door, the actuatingmechanism being anenclosed rack and gear providing constant torque, the operation of thedoor and the locking of the door being accomplished by piston-cylinderassemblies at the proximal end of the carriage out of the hightemperature zone adjacent the tooling,and a simplified automatic sandfeed system utilizing a large rubber ball check valve.

18 Claims, 7 Drawing Figures PATENTEDAUG 8l972 3.682.230

SHEET 1 0F 4 ?77\"ENTOR$. WARREN A. BLOWER GILBERT J. JANKE EDWARD 0.ABRAHAM a/azwm zmwgm A TTORNEYS PATENTEDIus aImz SHEET 2 [IF 4 I I I l'1 I I I I I l l INVENTORS. WARRE/V.A. BLOWER G/LBERT J. JAN/(E A rromvevs B EDWARD 0. ABRAHAM (7/214): l/yrz/fy flan"! //y 6 fin/"0LPATENTED U 8 3.682.230

INVENTORS. WARREN A. BLOWER GILBERT J. ,JA/VKE E DWARD D. ABRAHAM ATTORNEYS PATENTEDAus 8 I972 3.682.230

sum u or 4 lea we :75 l- 7 INVENTORS. WARREN A. BLOWER I G/LBERZ .1.JAN/(E EDWARD a ABRAHAM ATTORNEYS ROTATABLE CANTILEVERED SHELL MOLDINGMACHINE This invention relates generally as indicated to a shell moldingmachine and more particularly to a foundry shell machine for makingshell molds or cores.

In the shell molding process a foundry sand-resin mix is blown or dumpedfrom a hopper into a patterned box with the patterned surfaces of thebox being heated. The box is then inverted to remove excess sand, onlythat portion of the sand adjacent the heated patterned surface curingsufficiently so that when the excess sand is dumped back into the hoppera hollow or shell mold or core is formed. To accomplish the inversionthe pattern together with the hopper is usually inverted or turnedupside down and rocking may occur following such inversion to ensurethat all excess sand has been removed from the interior of the shell.

I-Ieretofore such machines have been difficult to service and maintainbecause of the lack of accessibility to the area about the machine.Moreover, a careless operator might get caught between closely adjacentrelatively moving parts.

It is a principal object of the present invention to provide a foundryshell mold or core machine having improved serviceability, maintenanceand safety.

Another principal object is the provision of a shell mole or coremachine utilizing a cantilever construction permitting greateraccessibility to the job.

A further object is the provision of such machine having an enclosedrack and gear mechanism providing constant torque for operation of thepivotally mounted tooling platen, the lock and swing drives for suchplaten being at the proximal or journalled end of the carriagesupporting the same to avoid the heat in the area of the tooling.

Still another object is the provision of such machine having an improvedautomatic sand feed system utiliz-' ing a rubber ball check valve andeliminating the need for diaphragm pinch-off valves.

A yet further object is the provision of such machine utilizing a singlelarge ball bearing supporting the radial thrust and moment loads of therotating carriage with a a substantial safety factor.

It is also, of course, an object to provide such machine of simplifiedconstruction for extra rigidity, dependable operation and minimummaintenance.

Other objects and advantages of the present invention will becomeapparent as the following description proceeds.

To the accomplishment of the foregoing and related ends, the invention,then, comprises the features hereinafter fully described, the followingdescription and the annexed drawings setting forth in detail a certainillustrative embodiment of the invention, this being indicative,however, of but one of the various ways in which the principles of theinvention may be employed.

In said annexed drawings:

FIG. 1 is a fragmentary vertical section of amachine in accordance withthe present invention;

FIG. 2 is an end elevation of the machine as seen from the left or line2-2 in FIG. 1;

FIG. 3 is an end elevation as seen from the right or line 33 of FIG. 1;

FIG. 4 is an enlarged fragmentary detail view of the lock pin actuatingmechanism;

FIG. 5 is a fragmentary'section of such mechanism taken substantially onthe line 5-5 of FIG. 4;

FIG. 6 is an enlarged fragmentary section of the rubber ball check valveof the sand feed system; and

FIG. 7 is a schematic pneumatic diagram of the machine showing theautomatic sand feed system with the blow and exhaust valves for thereservoir.

Referring first to FIGS. 1 through 3, it will be seen that a machine inaccordance with the present invention includes a machine base 10 in theform of an upstanding L including upstanding portion 11 and lowerlaterally directed portion 12 acting as a stabilizer firmly to supportthe machine on the floor F. The upstanding portion 11 of the base is inthe form of a housing substantially open at the back as indicated at 14.The side walls 15 and 16 are provided with access windowsas seen at 17.The front of the housing includes a pair of spaced upstanding plates 18and 19. The forward plate 19 has access windows 20 and 21 each providedwith a cover as seen in FIG. 3 as well as a center access window 22provided with cover 23. The upper end of the plate 19 terminates in anenlarged opening 25 provided with a cover 26 which has a circularinterior opening.

The inner upstanding plate 18 includes an opening 28 through whichprojects shaft 29 of cone drive gear motor 30. The walls 18 and 19 areinterconnected by webs 32 and 33 seen in FIG. 2 to form a rigid boxsection. The rear wall 18 is offset rearwardly as indicated at 34 and isprovided just above the offset with a circular opening indicated at 35.Just before the offset two spaced sprocket shafts 37 and 38 extendbetween the walls and have sprockets 39. and 40 journalled thereon. Suchsprockets are vertically aligned with sprocket 41 mounted on the gearmotor shaft 29.

A large diameter turntable ball bearing indicated generally at 43includes an outer race 44 secured by the plurality of fastenersindicated at 45 to the front of the wall 18 adjacent the opening 35. Theinner race 46 is secured by similar fasteners 47 to radially extendingflange 48 of rear trunnion frame 49 of the carriage shown generally at50. The balls of the bearing 43 may be separated in conventional mannerby a cage or by individual spacers The bearing 43 is designed to supportradial, thrust and moment loads of the carriage with a 25-1 factor ofsafety. For example, the static capacity of the bearing may be a momentin inch pounds of 4,900,000 while the actual applied load is only130,000.

The rear trunnion frame 49 of the carriage 50 includes fourlongitudinally extending sleeves seen at 52 in which are shoulderstopped tie rods 53, 54, and 56. The top rods 53 and 56 may be solidwhile the bottom rods 54 and 55 are hollow. Each rod is provided with areduced diameter threaded end seen at 57 projecting through the reartrunnion 49 and such rods are secured in place by nuts 58.

The distal or outer ends of the rods support a fron trunnion frame 60which has the plus sign opening 61 therein as seen more clearly in FIG.3. Nuts 62 are secured to the distal or outer ends of the rods beyondthe front trunnion frame 60.

A door 64 is hingedly mounted in the opening 61 of the front trunnionframe by means of the hinge pins indicated at 65 and 66 in FIG. 1. Suchhinge pins are secured to the door and mounted in the vertically spacedbushings indicated at 67. Thrust bearings are provided surrounding suchpins between the door and trunnion at 68 and 69. The latter may, ifdesired, be a ball thrust bearing.

The bottom pin 66 has secured to it a rack gear 70 between the bushingsin the opening provided in the front trunnion. The rack gear is inengagement with a rack on the end of rack gear shaft 71 extendingthrough the hollow tie rod 54. The rack gear shaft is connected to rod72 of piston-cylinder assembly 73 mounted on the back of rear trunnionframe 49 by the support brackets indicated at 74. When the door isunlocked, extension and retraction of the piston-cylinder assembly 73will cause the door to swing open and close.

The inside of the door 64 supports a two-part platen indicated generallyat 76, such platen including a mounting plate 77 provided with aplurality of parallel T-slots seen at 78 and a gas manifold backup plate79. The backup plate and the mounting plate form a chamber forconducting gas or other fuel through passages 80 in the mounting plate77 to which are connected burner tips 81. Mounting blocks 82 may besecured in the desired fashion to the T-slots 78 and are employed tofasten core box half 83 to the platen. The burner tips thus providedirect flame impingement against the core box or tooling. Depending uponthe shell mold or core being formed, only the necessary mounting blocksand burner tips need be employed, with those passages 80 not used beingplugged.

An opposed core box half 85 is mounted in similar fashion on two-partplaten 86 which is in turn mounted on adjustable frame 87. Such frame isprovided with four comer sleeves 88 each of which is slidably mounted onthe respective tie rod. The frame 87 is provided with a rearwardlyprojecting adjusting screw bushing 90, the interior of which is threadedon adjusting screw 91 provided with circular handle 92. The screw andhandle which may be pinned together are rotatably connected through cap93 to the rod 94 of pneumatic clamp cylinder 95. Such rod 94 projectsthrough the rear trunnion frame 49 and the clamp cylinder is secured tosuch frame by the fasteners indicated at 96. The clamp cylinder 95 issituated inside the cylindrical hose reel 97 projecting rearwardly fromthe trunnion frame 49. t 1

In this manner, the box half 85 may be moved toward and away from thebox half 83 to be clamped thereagainst. The box half 83 may be termedthe fixed half for clamp purposes although it is mounted on the door 64to be swung through 90 by the action of the piston-cylinder assembly 73to facilitate removal of the finished core or mold. When clampedtogether, the box halves form a cavity shown generally at 98 whichincludes one or more downwardly directed openings or sprues seen at 99.

Such openings may correspond to similar openings in the blowAccordingly, 101 of sand hopper 102. The sand hopper is supported bysupport rods 104 and 105 secured to the tie bars 55 and 54,respectively, by support rod clamps 106 and 107. Secured to andextending between the outer ends of the support rods is support bar 108to the underside of which is mounted single acting pneumatic cylinder109. The rod of the cylinder 109 engages the bottom of the hopper asindicated at 110 to urge the same upwardly or toward the box halves 85and 83 when extended. A cylindrical stop 1 1 1 is secured to the bottomof the hopper and engages the support bar 108 when the rod is retracted.Accordingly when the cylinder 109 is extended, the hopper is clampedagainst the box halves for introduction of a sand-resin mix into thecavity 98 and a gasket 1 12 is provided to eflect an air seal betweenthe hopper and the box when the cylinder is extended.

Referring now more particularly to FIGS. 2, 3, 4 and 5, the door 64 islocked and unlocked by actuation of piston-cylinder assembly 115, seenin FIG. 2, the rod of which is connected at 1 16 to clevis arm 117secured to the rearwardly projecting end of lock pin operating shaft 118which extends through the hollow center of tie rod rod 55. The blind endof such assembly 115 is pivoted to rear trunnion frame 49. The front end'of the operating shaft in the front trunnion frame 60 is journalled inbearing 120 and has secured thereto by the fastener indicated at 121laterally projecting operating lever 122. The lever projects throughwindow 123 in the tie rod and the distal end of such lever is providedwith a rotatably mounted shoe 124 fitting in a transverse slot on shortlock pin 125 which is slidably mounted in bushings 126 and 127.Extension and retraction of the piston-cylinder assembly 115 will ac- Icordingly cause the short lock pin 125 to move up and down. In FIG. 4,the pin is shown in its extended or lock condition. I

Now referring more particularly to FIG. 3, it will be seen that the door64 is provided with a long lock pin 130 which when the door is closedwill be in vertical alignment with the short lock pin 125. The long lockpin is slidably mounted in bushings 131 and 132 in bosses on the doorand is urged downwardly by compression spring 133 extending between theupper boss and collar 134. A stop collar 135 is also provided on thelong locking pin limiting its downward movement. In its upward or lockcondition, the long lock pin 130 extends into a bushing or seat 136 inthe front trunnion frame 60. It can now be seen that the piston-cylinderassembly will be eflective to lock and unlock the door 64 for swingingmovement by the piston-cylinder assembly 73.

When the piston-cylinder assembly 115 is extended, the operating shaft118 is rotated and the connection between such shaft and the short pinseen in FIGS. 4 and 5 causes the pin 125 to descend until the topthereof is clear of the bottom of the door. The spring 133 automaticallycauses the long pin to follow to the extent permitted by the stopremoving the long pin from the upper socket or seat. When the short pinis thus completely retracted, the door is then free to swing open at thedirection of the piston-cylinder assembly 73 through the rack and pinionseen in FIG. 1. An adjustable stop 140 engaging bumper 141 seen in FIG.3 limits the extent to which the door swings.

It can now be seen that the trunnion carriage 50 which includes: thedoor 64 on which the platen 76 is mounted; the sliding frame 87 on whichthe platen 86 is mounted; thedoor actuating and lock mechanisms; theclamp cylinder 95; and the hopper 102, is mounted in cantilever fashionfor rotation about a horizontal axis by the large diameter singlebearing 43. Rotation of the trunnion carriage in the desired fashion isobtained through the gear motor 30 which drives through sprocket 41drive chain 143, the position of which is seen more clearly in FIG. 2.The chain 143 extends about the drive sprocket 41 of the gear motor andis pinched between the idler sprockets 39 and 40 and then extends aboutthe rear trunnion frame 49, being secured thereto by chain anchor block144. One end of the chain is fixed-to the anchor block while the otherend is adjustably connected thereto by chain connector 145 An emergencystop block 146 is mounted on the rear trunnion frame 49 and ispositioned to engage spring loaded stops 148 and 149 should the carriageovertravel. Various control devices may be mounted on the rear trunnionframe 49 as seen in FIG. 2. For example, a terminal box may be mountedas indicated at 150 while a manifold may be mounted on bracket 151.Valve 152 is mounted as illustrated. A limit switch cam 153 is providedtogether with switch actuator rod 154 and mounting plate 155 for a limitswitch. All of the control devices are readily accessible through therear of the machine and do not require operators or maintenancepersonnel to be exposed to the projecting moving parts of the trunnioncarriage while servicing th machine.

Referring now toFIGS. 6 and 7, it will be seen that sand isautomatically fet to the hopper 102 through check valve 160 mounteddirectly on the hopper wall as seen in greater detail in FIG. 6. Thevalve 160 includes a nipple 161 welded to the hopper wall and a bellcoupling 162 is secured to the nipple and a sand hose adapter 163 isinternally secured to the bell coupling. The entire valve is surroundedby heat insulating material seen at 164. The bell coupling forms ahousing for relatively large diameter rubber ball 165. The ball isprecluded from entering the hopper 102 by cross pins 166 and 167 securedtransversely in the nipple 161. The valve 160 functions to permit sandto enter the hopper 102 when the latter is not pressurized and furtherfunctions to preclude sand from being blown back into the sand feedsystem when the hopper is pressurized. The ball will seat as indicatedin FIG. 6 when the hopper is pressurized.

Sand is fed from reservoir 170 seen in FIG. 7 dropping throughY-connectors 171 and 172, the latter being provided with air nozzle 173.Air from the plant source may be reduced in pressure by pressureregulator 174 to approximately 30 to 40 p.s.i. and the operator byactuating valve 175 introduces air to the nozzle 173 through check valve176. When the valve 160 is open, the sand will be blown into the hopper102.

The hopper is also, of course, provided with the pilot operated blow andexhaust valves seen at 178 and 179, respectively, the latter including asand filter 180.

OPERATION I With the door 64 closed, the clamp cylinder 95 is actuatedto assemble the box halves 83 and 85 to form the core or mold box. Withthe machine in the FIG. 1 position, the hopper cylinder 109 is actuatedclamping the hopper against the box halves establishing sealedcommunication between the hopper and the box halves. The gear motor 30is now actuated to invest or invert the trunnion carriage 50 swingingthe hopper to the position seen at 183 in phantom lines in FIG. 3. Atthis point, the blow valve 178 may be actuated blowing the sand from thehopper into the cavity 98. This ensures sand contact with the entirecavity wall. The hopper may now be exhausted. The gear motor 30 is againactuated to bring the trunnion carriage back to the position shown inFIG. 1 and excess sand will then drop from the cavity 98 back into thehopper 102. To ensure that all of the excess sand has returned to thehopper, the machine may rock from side-to-side through approximately 45from vertical as seen by the phantom line position 184 in FIG. 3.-Thesand-resin mix contacting the hot cavity wall will cure the resinforming a shell mold or core. That portion of the sand-resin mix whichis not cured will then drop back into the'hopper for reuse in theproduction of the next mold or core. As seen in FIG. 2, the emergencystop block 146 will move to the phantom line position 185 when thetrunnion carriage isinverted and during the 45 rocking action will moveon one side to the phantom line position 186.

After the excess sand is back in the hopper 102, the pistoncylinderassembly 109 returns the hopper to its down or unclamped position andthe clamp cylinder 95 may now be retracted leaving the core or mold inthe box half 83. Suitable vibrators or strippers may be provided on theframe 87. The door 64 is now unlocked by actuation of thepiston-cylinder assembly and as soon as the long and short lock pinshave cleared the door, the piston-cylinder assembly 73 will open thedoor through the enclosed rack and gear mechanism providing constanttorque. The finished sand article will then be swung with the door to beexposed at the front of the machine and the operator may then remove thearticle again with the assistance of a stripping or ejector mechanism aswell as a vibrator if desired. The box pattern surfaces may then beblown off and the cycle repeated with the operator refilling the hopperat any time when it is clamped and vented by actuation of the valve 175.

It can now be seen that there is provided an improved foundry shell moldor core machine having improved serviceability, maintenance and safety.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. In a roll-over shell molding machine, a rotatable carriage supportingseparable tooling platens on horizontally extending tie rods, oneseparable platen being hingedly mounted to said carriage, and meansextending through said tie rods operative to unlock and swing saidhingedly mounted platen.

2. A machine as set forth in claim 1, further including a base having anupstanding portion, the carriage at one end being journalled in saidupstanding portion for rotation about a horizontal axis, said carriageprojecting from said upstanding portion of said base in cantileverfashion.

3. A foundry machine for making shell molds or cores comprising acarriage journalled in and cantilevered from an upstanding base forrotation about a horizontal axis, tooling platens mounted on saidcarriage for relative movement, a sand hopper adapted to be clampedagainst the tooling on said platen, and a sand feed mechanism for saidhopper including both a rubber ball check valve mounted on said hopperand means to blow sand past said check valve when said hopper is vented.

4. A machine as set forth in claim 2 wherein one of said tie rodsincludes a longitudinally movable shaft therein with a rock on one end,a pinion engaging said rack on the hinge of said plate, and apiston-cylinder assembly connected to the opposite end of said shaft forswinging said hingedly mounted plate with uniform torque.

5. A machine asset forth in claim 2 wherein one of said tie rodsincludes a rotatably mounted actuating shaft extending therethroughoperative to unlock said hingedly mounted plate for swinging movement.

6. A machine as set forth in claim 5 including spring loaded lockingpins linearly movable by rotation of said operating shaft.

7. A machine as set forth in claim 6 including a piston-cylinderassembly at the proximal end-of said tie rod operative to rotate saidoperating shaft thus to lock and unlock said hingedly mounted plate.

8. A machine as set forth in claim 2 wherein said carriage includes asand hopper, and means operative to clamp said hopper to such mold boxhalves.

9. A machine as set forth in claim 8 including chain drive meansoperative to invert said carriage.

10. A machine as set forth in claim 1 wherein said base is in the shapeof an L and includes a horizontally extending bottom portion and anupstanding portion, said carriage projecting from said parallel to saidbottom portion.

11. A foundry machine for making shell molds or cores and the likecomprising a carriage, tooling platensmounted on said carriage forrelative movement, a base having an upstanding portion, a bearing insaid upstanding portion in which one end only of said carriage isjoumalled for rotation about a horizontal axis, said carriage projectingin cantilever fashion from said upstanding portion of said base, and asand hopper I mounted on said cantilevered portion of said carriage.

upstanding portion 7 means to pressurize said hopper to facilitate theblowing of sand into such tooling. v

13. A machine as set forth in claim 12 including a sand feed machine forsaid hopper including a rubber ball check valve mounted on said hopper,and means to blow sand into said hopper past said check valve when saidhopper is vented. I v

14. A machine as set forth in claim 1 1 wherein one of said platens ismounted on a swinging door'at the distal end of said carriage, and meansat the proximal end of said carriage operative to unlock said door andopen and close said door.

15. A machine as set forth in claim 14 wherein said carriage includes aplurality of horizontally extending tie rods, said last mentioned meansextending through at least some of said tie rods to unlock and actuatesaid door. I

16. A'machine as set forth inv claim 11 including a motor and chaindrive operative to rotate said carriage about its horizontal axis.

17. A machine as set forth in claim 11 wherein said tooling platens eachinclude a mounting plate and a gas manifold plate, said mounting platebeing provided with a plurality of gas passages interconnecting the gasmanifold passages on one side of said mounting plate,

cores and the like comprising a carriage, tooling platens mounted onsaid carriage for relative movement, one of said platens being mountedon a swinging door at the distal end of said carriage, a base having anupstanding portion, a bearing in said upstanding portion in which oneend only of said carriage is joumalled for rotation about a horizontalaxis, said carriage pro- 3 5 jecting in cantilever fashion from saidupstanding por- 12. A machine as set forth in claim 11 wherein said tionof said base and actuation means located at the proximal end of saidcarriage and linked to said door

1. In a roll-over shell molding machine, a rotatable carriage supportingseparable tooling platens on horizontally extending tie rods, oneseparable platen being hingedly mounted to said carriage, and meansextending through said tie rods operative to unlock and swing saidhingedly mounted platen.
 2. A machine as set forth in claim 1, furtherincluding a base having an upstanding portion, the carriage at one endbeing journalled in said upstanding portion for rotation about ahorizontal axis, said carriage projecting from said upstanding portionof said base in cantilever fashion.
 3. A foundry machine for makingshell molds or cores comprising a carriage journalled in andcantilevered from an upstanding base for rotation about a horizontalaxis, tooling platens mounted on said carriage for relative movement, asand hopper adapted to be clamped against the tooling on said platen,and a sand feed mechanism for said hopper including both a rubber ballcheck valve mounted on said hopper and means to blow sand past saidcheck valve when said hopper is vented.
 4. A machine as set forth inclaim 2 wherein one of said tie rods includes a longitudinally movableshaft therein with a rock on one end, a pinion engaging said rack on thehinge of said plate, and a piston-cylinder assembly connected to theopposite end of said shaft for swinging said hingedly mounted plate withuniform torque.
 5. A machine as set forth in claim 2 wherein one of saidtie rods includes a rotatably mounted actuating shaft extendingtherethrough operative to unlock said hingedly mounted plate forswinging movement.
 6. A machine as set forth in claim 5 including springloaded locking pins linearly movable by rotation of said operatingshaft.
 7. A machine as set forth in claim 6 including a piston-cylinderassembly at the proximal end of said tie rod operative to rotate saidoperating shaft thus to lock and unlock said hingedly mounted plate. 8.A machine as set forth in claim 2 wherein said carriage includes a sandhopper, and means operative to clamp said hopper to such mold boxhalves.
 9. A machine as set forth in claim 8 including chain drive meansoperative to invert said carriage.
 10. A machine as set forth in claim 1wherein said base is in the shape of an L and includes a horizontallyextending bottom portion and an upstanding portion, said carriageprojecting from said upstanding portion parallel to said bottom portion.11. A foundry machine for making shell molds or cores and the likecomprising a carriage, tooling platens mounted on said carriage forrelative movement, a base having an upstanding portion, a bearing insaid upstanding portion in which one end only of said carriage isjournalled for rotation about a horizontal axis, said carriageprojecting in cantilever fashion from said upstanding portion of saidbase, and a sand hopper mounted on said cantilevered portion of saidcarriage.
 12. A machine as set forth in claim 11 wherein said carriageincludes a sand hopper, means to clamp said hopper against the toolingmounted on said platen, and means to pressurize said hopper tofacilitate the blowing of sand into such tooling.
 13. A machine as setforth in claim 12 including a sand feed machine for said hopperincluding a rubber ball check valve mounted on said hopper, and means toblow sand into said hopper past said check valve when said hopper isvented.
 14. A machine as set forth in claim 11 wherein one of saidplatens is mounted on a swinging door at the distal end of saidcarriage, and means at the proximal end of said carriage operative tounlock said door and open and close said door.
 15. A machine as setforth in claim 14 wherein said carriage includes a plurality ofhorizontally extending tie rods, said last mentioned means extendingthrough at least some of said tie rods to unlock and actUate said door.16. A machine as set forth in claim 11 including a motor and chain driveoperative to rotate said carriage about its horizontal axis.
 17. Amachine as set forth in claim 11 wherein said tooling platens eachinclude a mounting plate and a gas manifold plate, said mounting platebeing provided with a plurality of gas passages interconnecting the gasmanifold passages on one side of said mounting plate with burner tips onthe opposite side.
 18. A foundry machine for making shell molds or coresand the like comprising a carriage, tooling platens mounted on saidcarriage for relative movement, one of said platens being mounted on aswinging door at the distal end of said carriage, a base having anupstanding portion, a bearing in said upstanding portion in which oneend only of said carriage is journalled for rotation about a horizontalaxis, said carriage projecting in cantilever fashion from saidupstanding portion of said base and actuation means located at theproximal end of said carriage and linked to said door for locking andunlocking said door and for opening and closing the same.